Digital immortality (or “virtual immortality“) is the hypothetical concept of storing (or transferring) a person’s personality in more durable media, i.e., a computer, and allowing it to communicate with people in the future. The result might look like an avatar behaving, reacting, and thinking like a person on the basis of that person’s digital archive. After the death of the individual, this avatar could remain static or continue to learn and develop autonomously.
From another perspective, digital immortality could also mean the hypothetical concept of transferring your personality into a machine so that even after the death of the physical body, you can continue to live out of the machine (continue to learn and develop autonomously.)
Digital Longevity is a humbler version of Digital Immortality, as immortality brings in endlessness to the whole equation.